Machine tool



FIG. 1 is a rear perspective view of a machine tool showing our new design;

FIG. 2 is an additional rear perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a right-side elevational view thereof; and,

FIG. 7 is a left-side elevational view thereof.

The broken lines in the drawings form no part of the claimed design; the dash-dotted lines represent the unclaimed boundaries. 

CLAIM The ornamental design for a machine tool, as shown and described. 